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|
package monitoring
import (
"crypto/tls"
"net"
"github.com/prometheus/client_golang/prometheus"
"gitlab.com/gitlab-org/labkit/log"
"gitlab.com/gitlab-org/labkit/monitoring"
"gitlab.com/gitlab-org/gitlab-shell/internal/config"
"gitlab.com/gitlab-org/gitlab-shell/internal/sshd"
)
var tlsVersions = map[string]uint16{
"": 0, // Default value in tls.Config
"tls1.0": tls.VersionTLS10,
"tls1.1": tls.VersionTLS11,
"tls1.2": tls.VersionTLS12,
"tls1.3": tls.VersionTLS13,
}
type WebServer struct {
ListenerConfigs []config.ListenerConfig
listeners []net.Listener
}
func (w *WebServer) Start(version, buildTime string, sshdServer *sshd.Server) error {
var prometheusRegisterer prometheus.Registerer
for _, cfg := range w.ListenerConfigs {
if cfg.Addr == "" {
continue
}
listener, err := w.newListener(cfg)
if err != nil {
return err
}
monitoringOpts := []monitoring.Option{
monitoring.WithListener(listener),
monitoring.WithServeMux(sshdServer.MonitoringServeMux()),
}
// We have to cache and reuse Prometheus registerer in order to avoid
// duplicate metrics collector registration attempted by Labkit
if prometheusRegisterer == nil {
monitoringOpts = append(monitoringOpts, monitoring.WithBuildInformation(version, buildTime))
} else {
monitoringOpts = append(monitoringOpts, monitoring.WithPrometheusRegisterer(prometheusRegisterer))
}
go func() {
if err := monitoring.Start(monitoringOpts...); err != nil {
log.WithError(err).Fatal("monitoring service raised an error")
}
}()
prometheusRegisterer = prometheus.DefaultRegisterer
w.listeners = append(w.listeners, listener)
}
return nil
}
func (w *WebServer) newListener(cfg config.ListenerConfig) (net.Listener, error) {
if cfg.Tls == nil {
log.WithFields(log.Fields{"address": cfg.Addr}).Infof("Running monitoring server")
return net.Listen("tcp", cfg.Addr)
}
cert, err := tls.LoadX509KeyPair(cfg.Tls.Certificate, cfg.Tls.Key)
if err != nil {
return nil, err
}
tlsConfig := &tls.Config{
MinVersion: tlsVersions[cfg.Tls.MinVersion],
MaxVersion: tlsVersions[cfg.Tls.MaxVersion],
Certificates: []tls.Certificate{cert},
}
log.WithFields(log.Fields{"address": cfg.Addr}).Infof("Running monitoring server with tls")
return tls.Listen("tcp", cfg.Addr, tlsConfig)
}
|
